System-Wide Transparent FTP Tunneling with Fallback
In this example transparent FTP tunneling is configured to secure file transfers to three different subnets (
192.168.93.0/25). Configuration is done system-wide affecting all FTP batch jobs and interactive sessions to those three subnets. FTP connections to other addresses are not affected.
In this example SSH Tectia SOCKS Proxy is configured to fall back to plain FTP if securing the connection fails. Fallback is a usable feature during the migration phase but must be turned off once all connections are working correctly.
Do the following steps:
- Copy the
/etc/ssh2/ssh-socks-proxy-config-example.xml configuration file to
/etc/ssh2/ssh-socks-proxy-config.xml (if it does not exist yet), and edit the file to enable fallback to plaintext FTP:
- Start the SOCKS Proxy if it is not already running.
If the SOCKS Proxy is already running, take the updated configuration in use as instructed in Section Reconfiguring ssh-socks-proxy.
- Edit the system-wide FTP configuration file
SYS1.TCPPARMS(FTPDATA) to include the following lines:
- Create a new SOCKS configuration dataset
EXAMPLE.SYSTEM.SOCKS.CONF with the following contents:
sockd @=127.0.0.1 10.70.20.0 255.255.255.0
sockd @=127.0.0.1 172.16.8.0 255.255.248.0
sockd @=127.0.0.1 192.168.93.0 255.255.255.128
direct 0.0.0.0 0.0.0.0